"""RAG检索系统组件"""
from typing import Dict, List, Optional, Any
from datetime import datetime
import uuid
import re

class Document:
    """文档数据结构"""
    def __init__(self, title: str, content: str, source: str = ""):
        self.id = str(uuid.uuid4())
        self.title = title.strip()
        self.content = content.strip()
        self.source = source
        self.created_at = datetime.now()

class RAGSystem:
    """RAG系统管理类"""
    def __init__(self, max_documents: int = 10000):
        self.max_documents = max_documents
        self.documents = {}
        print("RAG系统初始化完成")

    def add_document(self, title: str, content: str, source: str = "") -> str:
        """添加文档"""
        if not content or not content.strip():
            raise ValueError("文档内容不能为空")
        document_id = str(uuid.uuid4())
        self.documents[document_id] = {
            "id": document_id,
            "title": title.strip(),
            "content": content.strip(),
            "source": source
        }
        self._cleanup_old_documents()
        return document_id

    def retrieve(self, query: str, limit: int = 5) -> List[Dict]:
        """检索相关文档"""
        if not query or not query.strip():
            return []
        scored_documents = []
        for doc_id, doc in self.documents.items():
            if query.lower() in doc["content"].lower():
                scored_documents.append(doc)
        scored_documents.sort(key=lambda x: len(x["content"]))
        return scored_documents[:limit]

    def _cleanup_old_documents(self):
        """清理旧文档，保持容量限制"""
        if len(self.documents) <= self.max_documents:
            return
        # 简化的清理逻辑
        pass

if __name__ == "__main__":
    print("RAG系统模块加载完成")
